- International Normalized Ratio (INR) ≤1.5 except for patients on stable anticoagulant therapy. Activated partial thromboplastin time (aPTT) ≤1.5 times upper limit of normal (ULN) or greater than the lower limit of the therapeutic range. Note: The use of full-dose oral or parenteral anticoagulants is permitted as long as the INR or aPTT is within therapeutic limits (according to the medical standard in the institution) and the patient has been on a stable dose of anticoagulants for at least two weeks at the treatment start.